Inquiring minds are looking at the newest data for commercial real estate.

Defaults on apartment-building mortgages held by U.S. banks climbed to a record 4.6 percent in the first quarter, almost twice the year-earlier level, as more borrowers failed to repay debt approved near the market peak, said Real Capital Analytics Inc. in a report.

Defaults on so-called multifamily mortgages rose from 4.4 percent in the fourth quarter and from 2.4 percent during the same period in 2009, the New York-based real estate research firm said today. Commercial-mortgage defaults also rose in the first quarter for loans against office, retail, hotel and industrial properties, Real Capital said.

“Apartment defaults are leading other commercial real estate,” Sam Chandan, global chief economist at Real Capital, said in an interview. “Banks tended to make more aggressively underwritten apartment loans earlier during this last cycle. Credit and pricing reached their peaks for office properties and other commercial assets later.”